Absorption apparatus for analyzing gases



P. R. BOULTON.

ABSORPTION APPARATUS FOR ANALYZING GASES.

APPLICATION FILED APR-6, 1920.

1,390,488. v PatentedSept. 13, 1921.

3 A A l n n n Inventor 12133010021020,

Attoim UNITED stares ABSORPTION APPARATUS ANALYZING GASES.

v To all whom it may concern:

Be it known that I, PERCIVAL RAYMOND BOULTON, a subject of the King of Great Britain and Ireland, residing at 8 Holly Lane, Erdington, in the'city of Birmingham, England, have invented certain new and use ful Improvements Relating to Absorption Apparatus for Analyzing Gases, of whichv the following is a specification.

This invention relates to absorptionapparatus for analyzing gases and particularly to apparatus for determining the amount of carbon dioxid in the flue gases from steam generators or other furnaces. The invention has for its object to provide improved portable means whereby the required determination can be effected in a simple and expeditious manner. 7

The accompanying drawing illustrates diagrammatically a portable absorption apparatus constructed in accordance with this invention. I r

In carrying the invention into effect as shown, a case a has arranged within it a pump cylinder 12. -A piston c sliding within the cylinder is operated by a rod d projectin through a gas-tight stuffing box 6. VVIthin the case is arranged a desiccating chamber f which is charged with any convenient solid material such as calcium chlorid for absorbing moisture from the gas sample. At its upper end the chamber is provided with any convenient pipe connection through which gas can be admitted to the chamber. Also within the case as arranged a chamber g containing any suitable solid absorbent for the gas constituent to be estimated. For carbon dioxid soda lime may be used as the absorbent. Preferably the upper end of the absorbent chamber is fitted with a collapsible rubber or other impervious bulb g to prevent the occurrence of any relatively large diminution of pressure in the said chamber.

Under the ordinary pressure variations found in practice no appreciable action occurs in the said bulb as it is made stilt enough to resist normal variations, but an abnormal diminution of pressure will cause it to sag slightly and so neutralize tosome extent the elfect of the reduced pressure. p

A closed gage chamber it within the case is fitted with a collapsible rubber or other I Specification of Letters Patent. Application filed April 6,

1920. Serial No. 371,702.

gage bulb 71 containing colored water or other liquid and connected to a glass gage tube j which is visible through an aperture in the case. The tube j opens into an .overflow enlargement is which is open at its upper end to the atmosphere. To prevent accidental spilling of thegage liquid when the apparatus is not in use the upper open end of the. gage tube may be closed by a cap.

rear I e ar.

Patented Sept. 13, 192i.

The upper ends of the cylinder 6 and absorbent chamber 9 communicate with each other by a passage Z, and with the gage chamber it by a'pipe r The cylinder 6 and chamber f, g and it have their lower ends "arranged over aper tures 11,, 11. n respectivelyinthe base, these apertures being controlled by a rotatable valve disk o. The'latter is formed in any convenient manner with passages by which the said apertures can be opened or closed or put into the required communica tion as hereinafter described. The valve passages are not shown'in the drawing as the arrangement will be obvious from the following description. I

In operation the valve is first set to connect the passages n, n and open the passage 72 to atmosphere. The piston is then pulled out to the limit of its movement thereby a proper charge is drawn into the cylinder and the valve is moved to close the chambers f and h and put the cylinder ,6 into communication with the absorbent chamber a. The piston is now returned and caused to discharge the gas sample through the absorbent into the opposite side of the cylinder An increase of pressure will by this operation usually be produced in the gage chamber 71 owing to the capacity of the cyl; inder being less on the upper side of the piston than the lower side.

If no gas has been absorbed it will be necessary to withdraw the piston to its original position at the upper end of the cylinder to restore the original pressure in the chamher, but if absorption has occurred a smaller the piston rod can be graduated accord-- ingly. If desired the increase or" pressure produced in the gage chamber when the sample is discharged from the pump can be usedas the required measure, but the former method is more convenient as the gage is then only needed to indicate a zero condition. An adjustable index is mounted on the tube j for use in indicating theinitial level of the gage fluid. i

Preferably the portion ofthe case containing the parts f, q, and divided off by the partitions 79 is filled with water and the case is covered with material having a low thermal conductivity to" maintain a constant temperature within the apparatus. In the drawing the parts I), f, and g, are shown in the plane of section for convenience of illusQ tration. Actually they are arranged in different planes within a case of circular or other cross section.

Having thus described my invention what 7 I claim as new and desire to secure by Letters Patent is :V i y V In portable absorptionapparatus for analyzing gases, the combination comprising a vertical reciprocatory; pump,-; absorption chamber, and pressure gage chamber, the absorptionchamber being permanently open at its upper end to the upper side of the pump and to the gage chamber a vertical desiccatlng chamber, a gas inlet at the upper end of the desiccating chamber, a collapsible bulb forming part of a fluid pressure gage 1n the gage chamber, a'vertical gage tube in conjunction with the bulb, a case containing the above mentioned parts, said, case being formed with an aperture through which the gage tube is visible, a base formed with passages communicating with the lower ends of the aforesaid chambers and pump, and a rotary valve dlsk on the underside of her, and the gage chamber opened or closed to the atmosphere, substantially as described,

In testimony whereof I have signed my name to this specification.

'PERCIVAL RAYMOND Bo LfroN. 

